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Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Carrying Values
The carrying value of the Senior Notes at December 31, 2018 are reflected in our Consolidated Balance Sheet as follows (in thousands):
 
December 31, 2018
Long-term liabilities:
 
Principal amount
$
325,000

Debt discount, net of accumulated amortization of $273
(4,602
)
Debt issuance costs, net of accumulated amortization of $77
(1,290
)
Carrying value of the Senior Notes
$
319,108
Schedule of Maturities of Long-term Debt
The aggregate maturities of our long-term debt for the next five years subsequent to December 31, 2018 and thereafter are as follows (in thousands):
Years ending December 31,
 
2019
$
2,015

2020
1,298

2021
1,046

2022
553

2023
27,689

2024 and thereafter
3,439

Total
$
36,040

The aggregate maturities of our Convertible Notes for the five years subsequent to December 31, 2018 are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2019
 
$
—

 
$
(242
)
 
$
(242
)
2020
 
—

 
(270
)
 
(270
)
2021
 
6,346

 
(48
)
 
6,298

2022
 
—

 
—

 
—

2023
 
—

 
—

 
—

Total
 
$
6,346

 
$
(560
)
 
$
5,786

The aggregate maturities of our Senior Notes for the five years subsequent to December 31, 2018 are as follows (in thousands):
 
 
Principal Maturity
 
Discount Amortization
 
Present
 Value
Years ending December 31,
 
 
 
 
 
 
2019
 
$
—

 
$
(493
)
 
$
(493
)
2020
 
—

 
(528
)
 
(528
)
2021
 
—

 
(565
)
 
(565
)
2022
 
—

 
(605
)
 
(605
)
2023
 
—

 
(648
)
 
(648
)
Thereafter
 
325,000

 
(1,763
)
 
323,237

Total
 
$
325,000

 
$
(4,602
)
 
$
320,398